You cannot execute a conditional gift deed as per the conditions what you are mentioning here.
Instead of making a dummy gift deed, you can very well not make anything. You can make her an absolute owner orally and allow her to enjoy the full benefits for her lifetime without any interference while the property still lying in your name itself.
A gift may be conditional subject to provisions of TPA as laid in section 26 cited below:
26. When gift may be suspended or revoked.—
The donor and donee may agree that on the happening of any specified event which does not depend on the will of the donor a gift shall be suspended or revoked; but a gift which the parties agree shall be revocable wholly or in part, at the mere will of the donor, is void wholly or in part, as the case may be.
A gift may also be revoked in any of the cases (save want or failure of consideration) in which, if it were a contract, it might be rescinded.
Save as aforesaid, a gift cannot be revoked.
Nothing contained in this section shall be deemed to affect the rights of transferees for consideration without notice.